Tire Size Comparison Tool
Compare theoretical unloaded diameter, width, revolutions per mile, and speedometer difference.
Open tire comparison
Treadsley Tools
Consumer tire reference tools with clear calculations and plain-English limitations.
Tread Depth Converter
Convert tread depth between 32nds of an inch and millimeters.
Open tread converterPressure Converter
Convert tire pressure between PSI, kPa, and bar.
Open pressure converterMiles / Kilometers Converter
Convert distance between miles and kilometers.
Open distance converterTire Measurement Averaging Tool
Average multiple tread depth measurements by groove and position to create a cleaner current average tread depth value.
Open averaging toolTire DOT Lookup
Look up tire DOT plant codes, old DOT codes, manufacturers, and plant locations using NHTSA-based reference data.
Open DOT lookupTire Wear Rate Calculator
Estimate tread loss, wear rate, remaining tread life, and projected mileage from tread depth measurements.
Open wear calculatorMulti-Tire Wear Rate Report
Create a multi-tire tread wear report for 2, 4, 6, 8, or 10 tires with vehicle details, tire details, PSI at measurement, and printable report output.
Open multi-tire reportFeature Request
Suggest a tool, correction, or reference feature for Treadsley.
Request a featureTire Learning Guides
Read plain-English reference pages about tread depth measurement, tire sizing, diameter, speedometer difference, revolutions per mile, and UTQG.
Open learning guides